Timeline for The locus of the intersection point of two perpendicular tangents to a given ellipse
Current License: CC BY-SA 4.0
18 events
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| Apr 20, 2021 at 6:45 | history | protected | CommunityBot | ||
| Feb 26, 2020 at 19:19 | history | edited | Jean Marie | CC BY-SA 4.0 |
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| Sep 15, 2016 at 12:09 | comment | added | Matt | @Jack: That link was also given in Henry's answer. It is based on the thesis of Demetrios Bounakis. My comments under Henry's answer fill in the steps missing in Pamfilos's page and summarize the approach followed by Bounakis. | |
| Sep 7, 2016 at 18:44 | comment | added | Jack D'Aurizio | www.math.uoc.gr/~pamfilos/eGallery/problems/Director.html | |
| May 4, 2014 at 10:29 | vote | accept | Matt | ||
| Apr 26, 2014 at 14:10 | answer | added | Xavier Saint-Raymond | timeline score: 15 | |
| Apr 18, 2011 at 13:19 | vote | accept | Matt | ||
| May 4, 2014 at 10:29 | |||||
| Apr 18, 2011 at 4:47 | history | edited | J. M. ain't a mathematician |
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| Apr 18, 2011 at 3:09 | history | tweeted | twitter.com/#!/StackMath/status/59815741326770176 | ||
| Apr 18, 2011 at 0:28 | history | edited | J. M. ain't a mathematician | CC BY-SA 3.0 |
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| Apr 18, 2011 at 0:07 | comment | added | J. M. ain't a mathematician | As an additional note: what these answers show is that the orthoptic of an ellipse is a circle. The result is sometimes attributed to Monge. See this paper for instance. | |
| Apr 17, 2011 at 23:46 | answer | added | Blue | timeline score: 14 | |
| Apr 17, 2011 at 21:50 | answer | added | Henry | timeline score: 28 | |
| Apr 17, 2011 at 20:56 | history | edited | Arturo Magidin | CC BY-SA 3.0 |
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| Apr 17, 2011 at 20:40 | comment | added | Arturo Magidin | @Willie: The points at which the two tangents to the ellipse through that point are perpendicular to each other. | |
| Apr 17, 2011 at 20:40 | answer | added | Arturo Magidin | timeline score: 20 | |
| Apr 17, 2011 at 20:08 | comment | added | Willie Wong | two tangents? Tangents to what? perpendicular to what? | |
| Apr 17, 2011 at 19:51 | history | asked | Matt | CC BY-SA 3.0 |